How Much Protein Do You Need a Day? From the RDA to Active Adults

The short answer

The bare minimum for healthy adults is 0.8 grams of protein per kilogram of body weight a day, the RDA, or about 0.36 g per pound. The newer Dietary Guidelines for Americans 2025-2030 set a higher everyday goal of 1.2 to 1.6 g per kg. For a 150 lb adult that is 54 g at the minimum and 82 to 109 g a day on the new guideline.

People who train hard are often advised to aim higher still, and adults over 65 have a minimum of their own. The protein calculator works out both numbers from your weight, age and activity. Below is where each figure comes from, a worked example, and what it looks like on a plate.

The numbers, side by side

Who	Grams per kg a day	Source
All healthy adults, minimum	0.8 (the RDA)	National Academies, as summarized in Baum and Wolfe, 2015
Adults, everyday target	1.2 to 1.6	Dietary Guidelines 2025-2030
Exercising adults building or keeping muscle	1.4 to 2.0	International Society of Sports Nutrition, 2017
Over 65, minimum (the 1.2 to 1.6 goal still applies)	At least 1.0 to 1.2	PROT-AGE Study Group, 2013
Over 65 and active, minimum	1.2 or more	PROT-AGE, 2013

To use any row, divide your weight in pounds by 2.2046 to get kilograms, then multiply.

The RDA is a floor

The Food and Nutrition Board set the adult RDA at 0.8 g/kg a day for everyone over 18, including people over 65, based on the minimum intake needed to avoid a steady loss of lean body mass. The 2015 review by Baum and Wolfe points out that this sits at the very low end of the acceptable range, which runs from 10% to 35% of daily calories from protein. In other words, 0.8 g/kg is enough to prevent a shortfall, not a target to aim for.

The 2025-2030 Dietary Guidelines raised the bar

The tenth edition of the Dietary Guidelines, dated January 2026, gives protein serving goals of “1.2–1.6 grams of protein per kilogram of body weight per day, adjusting as needed based on your individual caloric requirements.” It also asks people to prioritize protein foods at every meal. The goal has no upper age limit (DGA 2025-2030, p.1), so it applies after 65 as well. This is the range the protein calculator uses for adults of every age.

Training hard

The International Society of Sports Nutrition says 1.4 to 2.0 g/kg a day is sufficient for most exercising people who want to build or keep muscle, and that this sits within the Institute of Medicine’s acceptable range. It suggests spreading protein evenly through the day, every 3 to 4 hours, at about 0.25 g/kg (or 20 to 40 g) per serving. The protein calculator’s “training hard” setting uses a range of 1.2 to 2.0 g/kg.

Older adults

The PROT-AGE Study Group recommends at least 1.0 to 1.2 g/kg a day for people over 65, 1.2 g/kg or more for those who exercise or are otherwise active, and 1.2 to 1.5 g/kg for most older adults with acute or chronic illness. These are minimums for over-65s, not a lower target: the Dietary Guidelines goal of 1.2 to 1.6 g/kg has no age limit, so it still applies, and PROT-AGE’s 1.0 to 1.2 g/kg is the least an older adult should get. The protein calculator shows both. The important exception: people with severe kidney disease who are not on dialysis may need to limit protein.

Worked example: 150 lb, 35 years old, active most days

1. Weight in kg. 150 ÷ 2.2046 = 68.04 kg.
2. Minimum (RDA). 0.8 × 68.04 = 54 g.
3. Everyday target. 1.2 × 68.04 = 82 g, and 1.6 × 68.04 = 109 g. So 82 to 109 g a day.
4. Per meal. Over three meals, the low end is about 27 g a meal.

If the same person trained hard most days, the sports range of 1.4 to 2.0 g/kg would be 95 to 136 g. At 70 years old and mostly sitting, at 140 lb (63.5 kg), the everyday target is still the Dietary Guidelines’ 1.2 to 1.6 g/kg, 76 to 102 g, and PROT-AGE’s 1.0 to 1.2 g/kg, 64 to 76 g, is the minimum.

What 90 grams looks like

Protein values from USDA FoodData Central, per 100 g, scaled to the portion:

Food	Portion	Protein
Greek yogurt, plain, nonfat	6 oz container (170 g)	17.3 g
Egg, hard-boiled	1 large (50 g)	6.3 g
Lentils, boiled	1 cup (198 g)	17.9 g
Tofu, firm	½ cup (126 g)	21.8 g
Chicken breast, roasted	3 oz (85 g)	26.4 g

One way to reach the target from the worked example:

• Breakfast: Greek yogurt and an egg, 23.6 g.
• Lunch: a lentil and tofu bowl with 1 cup of lentils and ½ cup of tofu, 39.7 g.
• Dinner: 3 oz of roast chicken with vegetables, 26.4 g.

That comes to 89.7 g, inside the 82 to 109 g range, before counting smaller sources like bread, milk or nuts. The food calorie lookup shows protein, carbs, fat and calories for everyday foods by real portion, so you can build your own version.

Protein in grams vs protein as a percentage

Some plans give protein as a share of calories instead of grams per kilogram. They answer different questions, so it helps to check one against the other. The macro calculator splits a calorie target into grams. At 2,000 calories with 25% from protein, that is 500 calories, or 125 g (protein has 4 calories per gram).

For the 150 lb person above, 125 g is 1.8 g/kg, above the everyday range and inside the sports range. If your percentage-based number lands far from your per-kilogram range, go with the per-kilogram one, since that is how the guidelines are written.

Common questions

Should I use my current weight or my goal weight? The guidelines are written per kilogram of body weight. If you carry a lot of extra body fat, your current weight can give a high number. A registered dietitian can tell you which weight to use.

Is more always better? Not for everyone. People with kidney disease should agree on a protein target with their doctor, as PROT-AGE’s exception shows.

Does plant protein count? Yes. Lentils and tofu in the table count toward your total gram for gram. The 2025-2030 guidelines suggest that vegetarians and vegans diversify plant protein sources.

I’m losing weight. Do I need more? Possibly. The ISSN says people who lift may need more, 2.3 to 3.1 g/kg, to keep as much lean mass as possible while eating fewer calories. That is a sports figure for trained lifters, so check with a registered dietitian before going that high. The calorie calculator sets the calorie side, and the workout plan generator builds a printable lifting week.

Common mistakes

• Treating the RDA as the goal. It is the minimum.
• Loading it all into dinner. Spreading protein over three or more meals is what both the Dietary Guidelines and the ISSN suggest.
• Mixing pounds and kilograms. 1.2 g per pound would be more than double 1.2 g per kilogram.
• Counting only meat. Dairy, eggs, beans, lentils and tofu all count toward the total.

This guide summarizes published recommendations and is not medical advice. Pregnancy, breastfeeding, kidney disease and other health conditions change protein needs. Talk to your doctor or a registered dietitian for a target that fits you.